The Wealth of Nations by Part 3 Chapter 4 Page 9

Upon the authority which the great proprietor necessarily had in such a state of things over their tenants and retainers was founded the power of the ancient barons. They necessarily became the judges in peace, and the leaders in war, of all who dwelt upon their estates. They could maintain order and execute the law within their respective demesnes, because each of them could there turn the whole force of all the inhabitants against the injustice of any one. No other persons had sufficient authority to do this. The king in particular had not. In those ancient times he was little more than the greatest proprietor in his dominions, to whom, for the sake of common defence against their common enemies, the other great proprietors paid certain respects.

To have enforced payment of a small debt within the lands of a great